Reversible mortise lock



Feb. 18,1958 M. FRESARD 2,823,538

REVERSIBLE MQRTISE LOGK Filed May 14, 1953 2 Sheets-Sheet 1 Fig.1

Fig.3

INVENTOR L MarceL FresarcL ATTORNEY Feb. 18, 1958 M. FRESARD 2,823,538

REVERSIBLE MORTISE LOCK Filed May 14, 1953 2 Sheets-Sheet 2 INVENTOR MarceL 'Fres ard AT ORNEY United States Patent REVERSIBLE MORTISE LOCK Marcel Fresard, Geneva, Switzerland, assignor to Mefina S. A., Fribourg, Switzerland, a Swiss company Application May 14, 1953, Serial No. 355,000

Claims priority, application Switzerland January 14, 1953 8 Claims. (Cl. 70--462) The present invention has for its subject a mortise lock of which the bevelled bolt is actuated by a handle and by a key.

- In locks of this type it is necessary to give the bolt a different position relative to the framework of the lock, according as to whether the door opens towards the left or towards the right. Locks have already been provided in which the bolt can occupy, according to requirements, one or other of the two positions above referred to.

It will thus be seen that by removing a single piece of the mechanism, that is to say the pin of the bolt rod pinning same to the transmission member, the lock can be corlilverted at will for a door opening to the left or to the rig t. One form of construction of the subject of the invention is shown, by way of example in the accompanying drawing, wherein:

Fig. l is an elevation of a lock with the bolt in the latching position, the cover plate being removed.

Fig. 2 is a cross-section on the line IIII of Fig. 1.

Fig. 3 shows the bolt in fully retracted position under the action of the handle.

Figure 4 shows the bolt in the latching position, subject to being extended by the key.

Figure 5 shows the bolt in full extended position deadlocked by key operation and therefore not subject to retraction by the'handle.

With reference to Fig. 1, the lock comprises a framework formed by abase plate 1 of which the edge 2 is bent ata right angle so as to serve as a support for the endplate 3. The shaft 4, of square cross-section, of the handle 5 is located in a hub 6 having two arms 7 and 8. The first of said arms is located between two stops 9, limiting its angular movements, and carries at its end a coiled spring 10. The second arm 8 engages with an arm 12 of a three-armed lever 11. The arm 13 of the lever 11 serves for hooking the other end of the spring and the third arm 14 carries at its free end a pivot 15 on which is hinged a coupling member 16. Said member is formed by a plate having two parts which project laterally, one 17 located in its upper part being adapted to come into contact with a part 19 hinged to a part secured to the bolt, and the other 18 adapted to come into contact with the key during actuation of the bolt.

The part 19 is formed by a plate hinged to a pin 20 carried by a rod 21 secured rigidly to the bolt 22. The latter has, in cross-section, the shape of a geometrical section in two symmetrical halves, for example, that of a square or a rectangle and is guided by the opening in the end plate through which it passes, whilst the rod 21 passes through a guide opening of a part 23 secured to the base plate 1.

The plate 19 has in its upper part a notch 24 with which engages the projection 17 of the plate 16 in the retracted position of the lock bolt. In its lower part it has two projections 25 and 25a adapted to come into engagement with the key during the actuation of the bolt.

The plate 19 has a guide groove 26 having at its end opposite the hinge pin 20, a lateral locking notch 27. A

projection 28 ofthe cover plate 1a (Fig. 2) engages with the groove 26 for guiding the longitudinal movements of the plate 19.

The operation of the lock is as follows:

In the normal position all the parts are in the position shown in Fig. 1. When the handle 5 is actuated the bolt is moved towards the interior of the lock, as shown in Fig. 3, by the levers 8, 12, 14 and by the coupling member 16 of which the projection 17 is in engagement with the notch 24 of the plate 19.

The lock may be actuated by means of the key 29 either for disengaging the bolt from the keeper and to bring it into the retracted position shown in Fig. 3, or for causing it to pass to the dead-locking position shown in Fig. 5.

For disengaging the bolt from the keeper, the key is turned in a clockwise direction (Fig. 4) and it will be seen that it comes into contact with the left hand side of the projection 25. The bolt is then moved towards the right against the action of the spring 10, for reaching the open position shown in Fig. 3.

For causing the lock to pass from the normal position shown in Fig. 1 to the deadlocked position shown in Fig. 5, the key 29 is turned in a counter-clockwise direction. It then comes into contact with the plate 16 by its projection 18 and lifts it for causing the projection 17 to leave the notch '24 of the plate 19. Thereupon the key comes into contact with the right hand side of the projection 25 of the plate 19 and pushes towards the left for bringing it together with the bolt 22 in the deadlocked position shown in Fig. 5.

As shown in Figs. 1 and 3 to 5, the plate 16 is provided at its vleft hand end with two lugs 16a, 16b :arranged transversely relatively to its longitudinal centre line. The hinge point 15 of the plate 16 on the lever 14 is located centrally in the lower lug whilst the upper lug is adapted to co-operate with the part 23 secured to the base plate 1 when the key 29 is actuated. In fact, as shown in Figs. 4 and 5, the rocking of the plate 16 in a counterclockwise direction, taking place when the key 29 comes into contact with the projection 18, takes place againstthe action of a torque of which the centre of rotation is located at the point of contact of the upper lug with the part 23 and the force of which is produced by the spring and is applied to the hinge point 15 by means of the lever 14. As a result the plate 16 thus applies to the plate 19, and through the medium of the projection 17, a force directed from the top downwards. When the dead-locked position shown in Fig. 5 is reached, the notch 27, located at the right hand end of the guide groove 26 is located opposite the projection 28 of the cover plate 1a. The pressure of the projection 17 causes the plate 19 to turn in a clockwise direction so that the projection 28 comes into engagement with the locking notch 27. The bolt is thus locked in the dead-locked position.

For passing from the dead-locked position to the normal position, the key 29-is turned in a clockwise direction. It then lifts the plate 19 and comes into contact with its projection 25a so as to produce movement of the bolt towards the right and to return all the members to the position shown in Fig. 1.

It will be seen that for converting a lock for a door opening to the left into a lock for a door opening to the right, it suffices to remove the cover plate In, and the hinge pin 20. Bolt 22 is withdrawn from the framework, turned about its horizontal axis by and re-inserted in its guide. Pin 20 is replaced in rod 21 and plate 19 to connect them. The cover plate 1a is mounted in position and the lock is ready for being secured to a door opening to the right.

I claim:

1'. Amortise lock comprising a framework and including an end plate, a beveled bolt having a transverse sec tion of a geometric figure consisting of two symmetrical halves and guided in the end plate, a rod rigidly connected at one end to the bolt and guided by the framewbrk, transmission means pivoted by a removable pin tothe other end of the rod, a door handle movably mounted in the framework, lever means fulcrumed on theframework and urged to engage the handle arid connected thereto and including an arm engaging thehandle, a coupling member connecting the transmission means to the door handle by the lever means arm and including means releasably' connecting the coupling member to the transmission means, whereby a key when inserted and turned in the framework will engage the coupling member to-disengage same from the transmission means and retract the bolt or project same to locking position, and said transmission means having means thereon for and engaging the framework to deadlock the bolt in its locking position, and whereby removal-of the pin and'extraction of the bolt and rod from the framework and reinsertion therein the bolt in reversed position will render the lock suitable for use on a door opening toward the right or left.

2. A mortise lock comprising a framework'and including an end plate, beveled bolt having a transverse section of a geometricfigure consisting of two symmetrical halves and guided in the end plate, a rod rigidly connected at one end to the bolt and guided by the framework, transmission means pivoted by a removable pin to "the other end of the rod, a door handle movably mounted in the framework, lever means fulcrumed on the framework and urged to engage the handle and connected thereto and including an arm engaging the handle, a coupling member connecting the transmission means to thedoor handle by the lever means arm and sliding along'the transmission means, the transmission means and coupling member'ineluding inter-engaging elements disengaged in the projected position of the bolt, whereby a key when inserted and turned in the framework will engagethe coupling member to disengage same from the transmission means and retract the bolt or project same to locking position, and said transmission means having means thereon for engaging the framework to deadlock the bolt in its locking position, and whereby removal of the pin and extraction of the bolt and rod from the framework and reinsertion therein of the bolt in reversed positi'on will render the lock suitable for use on a door opening toward the right or left.

3. A mortise lock according to claim 2 and wherein the transmission means has a guide slot with a widened notch at one end and a projection fixed to the framework engages in the slot and in the notch thereof in the projected locking position of the lock.

-- aw a 4. A mortise lock according to claim 3 and wherein the transmission means and coupling member are plates and the transmission means plate has a recess and the coupling member plate a projection received in the recess and disengaged from the recess in the projected position of the bolt.

5. A mortise lock comprising a framework, a bolt guided by theframework, a rod rigidly connected at one endto the bolt and guided by the framework, "a transmission means pivoted at one end to the'rodifor moving same and the bolt in either direction, means rigid with the framework guiding the transmission means during its movement along a predetermined path, a coupling member including a part engaging the transmission means, lever means fulcrumed in the framework and pivoted to the coupling member, a handle journaled in the framework and a spring connecting the lever means and the handle and urging the coupling member tea predetermined position engaging the'framework whereby'akey upon being inserted and turned in the framework will engage the coupling member to'disengage the part' thereof from the transmission means and thereafter 'retrac't the bolt or project the same to locking position, and said transmission means having means thereon for engaging the framework to deadlock the bolt in its locking-position.

6. The lock according to claim 5 and wherein the trans mission means has a slot with a widened end and the framework engages the slot to constrain the transmi ssion means to the-path and on swinging-motion of same is seated in the widened end of the slot to lock the trans mission means for deadlocking the bolt and the coupling member swings the transmission means after completing its path about its pivot connecting same to the rod.

7. The lock according to claim 6 and wherein the coupling member is a plate disposed parallel" to the transmission means and the latter has a notch'receiving the coupling member part in inoperative position of the bolt.

8. The lock according to claim 7 and wherein the transmission means is pivoted to the rod by a removablepin to-perrnit the use of the lock on a door opening 't o the left or right by turning the bolt on its' axis parallel to its path to its required position; 7

References Cited in the file of this patent UNITED STATES PATENTS 30,586 Parker Nov. 6, 1860 95,507 Petre Oct. 5; 1869 720,455 More Feb. 10, 1903 762,051 Hartman June 7,1904 1,751,184 Wodarra Marl 18, 19 30 FOREIGN PATENTS 720,246 Germany Apr. 29, 1942 

